Impulse transmitter



sept. 29, 1925. 1,555,583

R. H. MANSQN IMFULSE TRANSMITTER Filed oct. 5. 192i Fla@ max 754INVENTOR RAY H. MANON ATTORNEY la top view of the governor PatentedSept. 29, 1925.

UNITED STATES 1,555,683 rATENr ePrice..

BAY H. MANSON,OF ROGHESEEB, NEVI "YORK, ASEGNOR- TO THESTROMBEPtG--CARL- SON TELEPHONE MANUFJhCT'R-ENG IPORATON 0F NEW YORK.

("TNSPANY, 0F ROCHESTER, NEW YORK, A COB IMPULSE TRANSMITTER.

Application filed October 3i, 1921. Serial No. 505,216.

To all 'whom it may concern.'

Be it known that l. liar H. citizen of the United n hiervon, a states,residing at Rochester, in the county of Monroe and State of New York,have invented certain new and useful Improvements in impulseTransmitters, of which the'following is a full, clear, concise, andexact description.

This invention relates lto impulse transmitters and more particularly toimpulse transmitters for use in automatic telephone systems.

1t is the purpose of this invention 'to provide an impulse transmitterwhich is simple in construction, easy to manufacture and economical toinstall and maintain in operation.u

One of the main features in this invention is the novel arrangement of`the impulse springs and impulse cam by which the relative adjustment ofthe impulse springs is maintained independently of the temperaturevariations or inaccuracy of assembling these springs. l

The various features will appear from the detailed description andappended claims.

In the drawing, Fig. 1 represents a top plan view of the impulsetransmitter with the finger hold disk, numeral plate and ratchet gearremoved; Fig. 2 is a vertical section on the line 2;-2 of Fig. 3 lookingin the direction of the arrows; Fig.V 3 is a bottom view of Ithe impulsetransmitter, while Figs. a and 5v are side views of the same withcertain of the impulse mechanism omitted from Fig. Ll and with thelinger hold member and certain other portions omitted from Fig. 5; Fig.6 is a vertical sectional view taken on the line 6`-6 of Fig. 3; Fig. 7is a vertical sectional view of a portion of the impulse transmitterindieating the arrangement of the impulse cam shaft and governingmechanism; Fig. 8 is with the top of the governor cup cut away; Fig. 9represents a side view and a top view of the impulse finger hold disk, aportion of this disk being broken away; and Fig. l() represents a viewof the impulse cam showing the shape of the same. Fig. 11 is a modifiedshowing.

Referring more in detail to the drawings, 11 designates a cup or framehaving a flange 12 and struck up lugs 13 by which the impulsetransmitter may be secured to a telephone or other support. rThe cup 12is provided with a centra-l opening in which a hollow sleeve 14 isstaked. @n the upper portion of this sleeve a ratchet gear l5 providedwith ratchet tcethvon its upper surface and with gear teeth about itscircunr ference, is mounted for rotary and longitudinal movement on saidsleeve under the control of a flat spring 16. A headed shaft 17 to whichthe finger hold member 18 is secured, is inserted through the centralopening in the sleeve for rotary movement and to the lower end of saidshaft an off-normal cam 19 is secured by a nut 2() which also holds theshaft against longitudinal movement in the sleeve. rThe finger holdmember v18, is provided with two ratchets 21 which may be integral withfinger hold member 18 or hardened steel pieces secured in openings inthe finger hold member in any well known manner. rlhe number of theseratchets is immaterial provided they are symmetrically arranged withrespect to each other. flowever a large number of ratchets provides alarge wearing surface while the mentioned arrangement causes a balancedaction of the ratchets upon the ratchet gear. A supporting bracket 22 onwhich various parts of the mechanisms are mounted, is secured to the cup11 by means of screws threaded into the struck up lugs 23. ln theannular space defined by the bracket 22 and flange 12, a porcelainenamel numeral plate 24iis located and is held inV place by wires suchas 25 integral with the number plate and inserted through openings inthe bracket 22 and then bent at right angles. fin impulse shaft such as26 is mounted for rotary movement in a bearing in the bracket 22 and'ina bearing formed in supporting arm 27. A pinion 29 is formed on theimpulse shaft and a gear 28 is secured thereto' in any well knownmanner. The teeth of the pinion 29 are so constructed and positionedthat they mesh with the gear teeth of the ratchet gear' 15, while theteeth of the gear 28 mesh with the pinion teeth 30 formed on a governorshaft 3l. rThis governor shaft is mounted at one end in an opening instop 4A of the bracket 22 and at its other end in an opening in cupwhich cup is secured to the mainV cup or frame 11. rElie governor shaft31 supports two semi-circular plates 54 which are mounted to rotate onthe pivots 34 and a spiral spring such as 35 has its ends secured to themembers 61 adjustably mounted in plates 54 to resiliently holdtheir freeends from engalgijing the governorcup 33. It will be noted that themembers 61 are frictionally held in openings in plates 54 and that theirlower ends to which springs 35 is connected, are off-set. lNhen isdesired to increase or lower the speed of the 1 governor, the elements61 are rotated by means of a screw driver to increase ory liininish thetension of spring At the lower end of the impulse cam shaft 26 there ismounted an impulse cam 37 which y consists of insulating material and isshaped in the manner indicated in Fig. 10, @n bracket 38 which is struckup from the cup 11 there are insulatedly mounted a plurality of contactsprings 42, 45 and 46 to co-operate with off-normal cam 19 and withimpulsel cam 37.

In the operation of the impulse transmitter the operator inserts hisfinger in some one of the holes such as 39 of the finger hold disk 18and rotates this disk as well as the shaft 14 against the tension of themain spring 40 until the operators finger engages the finger stop 41.During this movement of the finger hold disk the ratchets 21 force theratchet gear 15 downward against the spring 16 so that the ratchet geardoes not partake of this rotary movement of the finger hold disk. Theratchet gear does not partake of this rotary movement owing to certainfriction of the apparatus but principally due to the fact that theimpulse spring 45 and cam 47 prevent any backward movement of theratchet gear. However, the olfnormal cam 19 is rotated with the shaft 14and closes the off-normal springs 42 for a purpose well known in thislart. As soon as the operators finger engages the stop 41, he removes itfrom the finger hold disk 18 whereupon the main spring 40 causes thisdisk to rotate until its lug 43 engages the stop 44 on the bracket 22between teeth of pinion 29. During the backward rotation of the disk 18,the ratchets 2l engage the ratchet teeth of the gear 15 whereby thisgear is rotated and since it `meshes with the pinion 29, the impulseshaft 26 and the impulse cam 37 are rotated to open the impulse springs45 and 46. It is essential tothe operation of the impulse transmitterthat these impulse springs 45 be opened and closed at a uniform rate ofspeed and for this purpose the centrifugal governor mentioned, isprovided to control the speed of the backward rotation of the impulsetransmitter as will now be described. The gear 28 engages pinion 30 ofthe governor shaft 31 and if the speed of this shaft accelerates toogreatly, the semi-circular plates 54 overcome the tension of the spring35 and their free ends engage the governor cup 33 and thereby act as abrake to lower the speed of the gear train.

'It is important to note the manner in which impulse springs 45 and 46are controlled. The impulse spring 46 is provided with an extension 47which rides on the insulated portion-of the impulse cam shaft while theimpulse spring 45 rides on the periphery of the cam 37. This arrangementinsures that there will be a uniform opening and closing of the impulsesprings 45 and 46 irrespective of the tension of these springs or othervariations due to the temperature changes' or inaccuracies of assembly.

It will also be noted that the impulse cam 37 and the impulse cam shaftare prevented from rotation in one direction by reason of the fact thatthe impulse spring 45 engages the notches 48 in this cam to prevent suchreverse rotation of this element.

F ig. 11 shows a modified arrangement of the impulse springs 45 and 46and a differently shaped impulse cam 37. In this arrangement the freeend of impulse spring 46 is positioned on one side of the impulse camshaft and the free end of impulse spring 45 is positioned on the otherside of this shaft. These springsare under tension and spring 46 at itsoff set portion 47 bears on the cylindrical cam ofthe impulse shaft,while spring 45 bears on the irregular cam 37.

What is claimed is 1. In an impulse transmitter, in combination with arotatable element having one surface of regular contour and a camsurface, of means for rotating said element one or more times,l animpulse spring` continuously bearing on said regular surface, and asecond impulse spring intermittently bearing on the cam surface.

2. In an impulse transmitter, the combination with a rotatable elementhaving surfaces, one of which is a cam surface, of means for rotatingsaid element, impulse springs normally in engagement with and bearing onsaid surfaces, and means including one of said impulse springs forpreventing rotation of said rotatable element in one direction.

3. In an impulse transmitter, the combination with a rotatable elementhaving one surface of substantial circular contour and a second surfaceof irregular contour, of means for rotating said rotatable element, animpulse spring for lcontinuously engaging said surface of circularcontour, another impulse spring intermittently engaging the surface ofirregular contour and co-operating with said first impulse spring, andmeans including one of said impulse springs and its associated cam for`preventing rotation in one direction of said rotatable element.

y4. In an impulse transmitter, the combination with a rotatable shafthavingone regular surface and a cam surface,of a pair of impulse contactsprings both tensioned towards said shaft, the free end of one impulsespring cosoperating with the regular surface and the free end of thesecond impulse spring co-operating with the cam surface and means torotate said impulse cam shaft to actuate said impulse contact springs.

5. In an impulse transmitter, thel combination With a rotatable impulseshaft having one regular surface and a cam surface, of a pair of impulsecontact springs mounted on the same side of and both tensioned towardssaid shaft, the free end of one impulse spring cri-operating with theregular surface and the free end of the second impulse springco-operating with the cam surface, and means to rotate said impulse camshaft to actuate said impulse contact springs.

6. In an impulse transmitter, the combination with a rotatable shaftprovided with a regular surface and a cam surface, of a pair of impulsesprings mounted adjacent to said shaft and arranged to be normally inengagement. with each other, the free end of one of said impulse springsbearing on the regular surface and the free end of the other impulsespring co-operating with said cam surface so as to obtain a'uniformopening of said contacts when said shaft is rotated, and means to rotatesaid shaft 7. ln an impulse transmitter, the combination with arotatable shaft having an actuating member' provided with substantiallyrigid ratchet teeth, of a spring motor actuated by said shaft to returnsaid shaft to its normal position, a gear train including at one end aratchet gear for engaging said ratchet teeth, a. governor, an impulseshaft controlled by said gear train and governor, said impulse shaftbeing provided With a surface of substantially circular contour and asecond surface of irregular contour, an impulse spring co-operating Witheach of said surfaces, said impulse springs being normally in engagementand arranged to be separated by the rotation of said surfaces andresilient means for forcing said ratchet gear into engagement With saidratchet tooth.

In Witness whereof, l hereunto subscribe my name this 29th day ofSeptember A. D. 1921.

RAY H. MANSON.

